Step 1: Using a large sauce pan over medium heat, heat 2 tablespoons olive oil and 2 tablespoons unsalted butter.
Step 2: Add 1 diced onion and 1 diced carrot and sautee until soft and golden brown. Add 2 cloves minced garlic and saute until fragrant, about 2 minutes.
Step 3: Add 1 quart chicken broth. Increase the heat to medium high and bring to a boil.
Step 4: Add 3 medium diced white potatoes, 2 stalks diced celery, 1 seeded and diced green bell pepper, 1 seeded and diced red bell pepper, 1 seeded and diced jalapeno pepper, 3 bay leaves, 2 sprigs of thyme, 2 tablespoons chopped parsley, 1 pound frozen chopped conch (thawed) and 2 (6-ounce) cans chopped clams with juice. Boil until potatoes are tender, about 10 minutes.
Step 5: Add 2 chopped beefsteak tomatoes and 1 cup marinara sauce. Reduce heat to a low boil, cover and cook for 5 minutes.